OEM Transmission Oil Cooler for 2007-2016 BMW 135i, 135is, 335i, 335i xDrive, 335is, 335xi, X1, Z4

What to Look for When Buying This Part:

• Check for leaks or damage: Visually inspect the cooler for any signs of damage.
• Ensure proper fit: Verify that the cooler is designed for your specific BMW model and year.
• Consider the material: Look for coolers made from durable materials like aluminum.

Quality Indicators for the Available Options:

What's Typically Included with the Part:

• The transmission oil cooler itself.
• Sometimes, mounting hardware (check the product description).
• Gaskets or seals may or may not be included (check the product description).

Difficulty Level and Estimated Time:

• Difficulty: Medium
• Estimated Time: 2-4 hours

Special Tools Needed (if any):

• Socket set
• Wrench set
• Torque wrench
• Screwdrivers
• Pliers
• Drain pan
• Coolant

Critical Steps and Tips:

1. Drain the Coolant: Properly drain the coolant system before starting.
2. Disconnect Hoses: Carefully disconnect the transmission fluid lines from the cooler. Have a drain pan ready to catch any fluid.
3. Remove Old Cooler: Remove the old cooler from its mounting location.
4. Install New Cooler: Install the new cooler and connect the transmission fluid lines.
5. Refill Coolant: Refill the coolant system and bleed any air from the system.
6. Check for Leaks: Start the engine and check for any leaks around the cooler and hoses.

Whether DIY is Recommended or Professional Installation is Better:

• DIY is possible for experienced mechanics.
• Professional installation is recommended if you are not comfortable working on your car's cooling system. Incorrect installation can damage the transmission.

Compare: Used OEM, Refurbished OEM, New Aftermarket

| Option | Description the best value, offering genuine factory parts that have been tested and inspected at significantly lower prices.

• Refurbished OEM: Factory parts that have been professionally restored with new components.
• New Aftermarket: Brand new third-party parts built to OE specifications.

Parts Commonly Replaced or Checked at the Same Time:

• Transmission filter: A clogged filter can restrict fluid flow and cause overheating.
• Transmission fluid: Old or contaminated fluid can damage the transmission.
• Transmission pan gasket: This gasket seals the transmission pan and prevents leaks.
• Transmission cooler lines: Damaged or leaking lines can cause fluid loss.

Why Replacing Related Parts Prevents Repeat Failures:

• Replacing the transmission filter and fluid ensures proper lubrication and cooling.
• Replacing the pan gasket prevents leaks and maintains proper fluid levels.
• Addressing any issues with the transmission cooler lines ensures proper fluid flow to the cooler.

How Long This Part Normally Lasts:

• Typically 80,000 - 150,000 miles or 7-10 years.

Factors That Affect Longevity:

• Driving habits: Aggressive driving can increase transmission temperatures and shorten the cooler's lifespan.
• Maintenance: Regular transmission fluid changes can help prevent clogging and corrosion.
• Environmental conditions: Exposure to road salt and debris can accelerate corrosion.
• Towing: Heavy towing puts extra strain on the transmission and cooler.

Budget vs Mid-Range vs Premium Options:

• Used OEM: $50 - $150
• Refurbished OEM: $100 - $250
• New Aftermarket: $150 - $350

Labor Cost Considerations if Applicable:

• Labor costs can range from $200 - $500 depending on the mechanic and location.

Total Job Cost Estimates:

• Used OEM: $250 - $650
• Refurbished OEM: $300 - $750
• New Aftermarket: $350 - $850

Known Issues for This Vehicle's System Related to This Part:

• Some models are prone to transmission overheating, especially when driven aggressively or in hot climates.
• Leaks from the transmission cooler lines are a common issue.
• The plastic end tanks on some aftermarket coolers can be prone to cracking.

Any TSBs or Common Complaints:

• Check with your local BMW dealer for any Technical Service Bulletins (TSBs) related to transmission cooling issues.
• Online forums often discuss common problems and solutions for these vehicles.

How to Confirm Proper Operation:

• Check the transmission fluid level.
• Monitor the transmission temperature using a scan tool or gauge.

What to Look/Listen for to Verify It's Working Correctly:

• Smooth and consistent shifting.
• No transmission warning lights.
• No unusual noises from the transmission.
• Normal transmission temperature readings.

Q: How do I know if my transmission oil cooler is leaking?
A: Look for reddish-brown fluid under your car, especially near the front. Also, check your transmission fluid level regularly. If it's consistently low, you may have a leak.

Q: Can I drive my car with a leaking transmission oil cooler?
A: It's not recommended. A leaking cooler can cause the transmission to overheat, which can lead to serious damage.

Q: How often should I change my transmission fluid?
A: Refer to your owner's manual for the recommended interval. Typically, it's every 30,000 to 60,000 miles, depending on driving conditions.

Q: Will a new transmission oil cooler improve my car's performance?
A: If your old cooler was clogged or damaged, a new cooler will help maintain proper transmission temperatures, which can improve shifting and overall performance.

Q: Is it okay to use an aftermarket transmission oil cooler?
A: Yes, but make sure it's a quality part from a reputable manufacturer and that it's designed for your specific BMW model.

OEM Part Numbers:

• BMW: 17217529499, 17217536929, 17217551647

Fits Years: 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016